Misaligned jets from Sgr A* and the Fermi/eROSITA bubbles

QUEST Center event
No
Speaker
Kartik Sarkar, The Hebrew University of Jerusalem
Date
05/01/2023 - 15:30 - 14:00Add to Calendar 2023-01-05 14:00:00 2023-01-05 15:30:00 Misaligned jets from Sgr A* and the Fermi/eROSITA bubbles The origin of the Fermi/eROSITA bubbles still remains a debated question. One of the popular theories is that the bubbles are driven by a past AGN jet from the Sgr A*. A crucial assumption for the claimed jet is that the jet is launched along the rotation axis of the Galaxy despite several observational pieces of evidence indicating a different picture. In this talk, I will discuss the general effects of a misaligned jet in the Milky Way ISM. We find that the dissipation of the claimed jet within the ISM is an essential requirement for simultaneously producing the symmetrical features of the Fermi/eROSITA bubbles and the observed x-ray signatures. We show that hydrodynamic jets from Sgr A* fail to produce these features and therefore are ruled out. Other Blackhole driven mechanisms such as a magnetic jet, accretion wind, or TDEs, can in principle produce these features provided their power is ~ 10^{40.5-41} erg/s.   Physics Building 202 Seminar Room 303 Department of Physics physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Physics Building 202 Seminar Room 303
Abstract

The origin of the Fermi/eROSITA bubbles still remains a debated question. One of the popular theories is that the bubbles are driven by a past AGN jet from the Sgr A*. A crucial assumption for the claimed jet is that the jet is launched along the rotation axis of the Galaxy despite several observational pieces of evidence indicating a different picture. In this talk, I will discuss the general effects of a misaligned jet in the Milky Way ISM. We find that the dissipation of the claimed jet within the ISM is an essential requirement for simultaneously producing the symmetrical features of the Fermi/eROSITA bubbles and the observed x-ray signatures. We show that hydrodynamic jets from Sgr A* fail to produce these features and therefore are ruled out. Other Blackhole driven mechanisms such as a magnetic jet, accretion wind, or TDEs, can in principle produce these features provided their power is ~ 10^{40.5-41} erg/s.

 

Last Updated Date : 21/11/2022